Fan



Patented July 5, 1927.

UNITED STATES PATENT" OFFICE.

ANTONIO PAJALIO, or DETROIT, MICHIGAN Application filed December air,the fan being adapted to disseminate or radiate heat and keep heated airin motion for cooling purposes.

My invention aims to provide a motor driven fan that may be finished toenhance or harmonize with the, finish of a motor or engine, and thus notdetract from the general appearance of the motor or engine. This isdesirable in connection with engines of automobiles when the motors orengines are displayed alone and in many instances have cheap, unsightlyfans that detract from the workmanship and design of the motor orengine. The construction of my. fan permits of a degree of ornamentationbeing embodied in the fan so that in addition to mechanical featuresthere will be pleas ing lines of design or ornamentation.

My invention further aims to construct a fan body of twoor moredissimilar metals,

one metal affording a rigid and durable fan element and the other acovering or finishing element adapted to more rapidly disseminate heatthan the covered elements. Still further, the metallic elements providea fan, propeller or like member that possess all the advantages of awooden propeller and more, because the metal elements are susceptible todurable fabrication and possess greater strength and usefulness.

My invention will be hereinafter specifically described and thenclaimed, and reference will now be had to the drawings, wherein a Figure1 is a front elevation of the fan;

Fig. 2 is a sectional View taken on the line IIII- of Fig. 1;

Fig. 3 is a rear elevation of the fan body, and

Fig. 4 is an enlarged cross sectional view taken on the line IV-IV ofFig. 3.

The reference numeral 1 denotes an inner fan element or member cut,stamped, and pressed from sheet metal to provide a bulging orconveXo-concave hub portion 2 and radially disposed blade members 3',which as shown are preferably in opposed relation. This fan element ormember maybe made of aluminum, iron or other durable metal and in someinstances may be cast thus possessing the requisite degree of rigiditynecessary 1n a fan or propeller body. The

v FAN.

7, 1925. Serial No. 73,654.

blades 3 have neck portions extending forwardly and outwardly at aninclination from the member 1, thus placing the greater part of theblades 3 in a plane in advance of the member 1, so'that the member ;1 orthe central portion of the fan will have adished or countersunkconfiguration. Each of the blades 3 are convexo-concave in cross sectionand radiating from the member 1 and the neck portions 4 of the bladesare embossed portions 5 adding rigidity to the neck portions ofsaidblades. At intervals throughout the length of each blade are bosses orspacing members 6 and the marginal edges of each blade are slightlyoffset, as at 7 for the purpose that will hereinafter appearj 8 denotesan outer fan element ormemher which has a central embossed hub portion 9that may take the formof a rosette or other ornamentation. Embossing thehub portion 9 lends rigidity to the same and provides an air chamber orspace 10 which materially aids in the dissipation of heat. The outerelement or member 8 is made of copper or a good conducting. materialthat may be easily fashioned to form a cover for the member 1 and itsblades 3. Similar to the member 1 there are blades 11 having neckportions 12 and thefbladesll are convene-concave in cross section withthe, marginal edges of said blades terminating in flanges 13 that areinturned and swaged over the offset edges 7 of the blades 3 with theflanges 13 flush with the inner faces of the blades 3 to form a smoothand continuous joint with said blades, so that each blade of the fanwill have a finished and rounded off appearance.

The blades 11 are embossed to provide stiffening members 14 and 15 withthe latter more pronounced or of greater depth than the former. Thesestiffening members receive the spacing members 6 and the outer spacingmembers are of greater depth than the inner members so that thestiffening members 14 and 15 will be pressed against collapse ifsubjected to an ordinary blow. The stiffening members 14 merge into thenecks 19 and extend from one neck portion to the other neck portion ofadjacent blades, thus further contributing to a design configurationabout the hub of the fan, as best shown in Fig. 1.

The members 1 and 8 are connected together by a plurality of screw bolts16 or other fastening means entering the peripheral flange 17 of aconical shaped hollow hub 18 which serves as a lubricant reservoir andis provided with a detachable plug 19 so that it may be filled withgrease, oil or a suitable lubricant. Axially of the hub 18 is a bearing20 for a spindle 21, shaft or other member on which the fan is mountedand adapted to be driven thereby. The bearing 20 is ported, as at 22, sothat the lubricant can easily reach the spindle 21 and caps, washers,nuts and other devices, generally designated 23 may be employed forsecuring the bearing 20 on the spindle 21 so as to establish a drivingrelation.

From the foregoing it will be observed that the hub portions of themembers 1 and 8 and the blades 3 and 11 are spaced apart to the extentof providing substantially a hollow fan body and the air gaps betweenthe blade members 3 and 11 contribute to the dissemination of heat whenthe fan is used in a. heated zone or supported from a motor or engineand driven thereby as a cooling device. In using a copper cover orfacing for the fan it is obvious that the copper serves as a conductorand will consequently cause a greater dissipation of heat than the othermetal entering into the construction of the fan body. The copper beingsusceptible to embossing and clean finishing permits of a degree ofornamenta tion which is not possible with ordinary galvanized iron fans,and it is obvious that the blades of the fan may be fashioned to providea desired contour for the specific purpose for which the. fan may beemployed.

One embodiment of my invention is to be illustrated, but it is to beunderstood that the structural elements are susceptible to suchvariations and modifications as fall within the scope of the appendedclaims.

What I claim is a.

1. A fan comprising two sheets of metal cut and stamped to providemembers, which are spaced apart and one of said members embossed tobrace the other member and maintain the spaced relation of said members,each member having a hub portion and blades, one of said members servingas an outer cover over the other member, and means securing the hubportions of said members together.

2. A fan comprising members fashioned to provide hub portions andblades, the

blades of said members having marginal cast metal and possessing greaterconductivity, said malleable metal cover having a portion thereof spacedfrom said cast metal.

4. A fan comprising matched metallic members secured together andforming blades and a hub portion, said members being connected togetherabout the hub portion and the members spaced apart longitudinally of theblades and at the hub portion, the greater part of the hub portion beingdished and substantially in the plane of said blades.

5. A fan as called for in claim i, and a hollow hub connected to saidfan by the same securing means connecting said members.

In testimony whereof I affix my signature.

ANTONIO PAJALIG.

